Chill-mold



FRANK CORDES, OF PITTSBURGH, PENNSYLVAIA.

CHILL-MOLD.

*v-q Specation of Letters Patent.

Patented Oct. 11, 1921.

.Application filed December 27, 1920. Serial No. 433,107.

To all 'La/tom t may concern.'

Be it .known that I, F RANK Corinne, a citizen of the United States,residing at Pittsbui-gh, in the county of Allegheny and State ofPennsylvania, have invented new and useful Improvement in Chill-Molds,of which the following is a full, clear, and exact description,reference being had to the accompanying drawings, forming part of thisspecication, in which z- Figure l is a plan view of a mold chillembodying my invention.

Fig. 2 is a transverse verticalsection of a chill mold embodying myinvention.

Fig. 3 is a detail view looking at the inner face of a portion of one ofthe moldV sections and showing a modification.

My invention has relation to chill molds, and more particularly to thattype of such molds in which the inner portion of the mold, which is incontact with the articles cast therein, is formed of a plurality ofseparated tongues or segments which facilitate the expansion andcontraction of the mold in a well known manner. My invention is designedto provide a novel construction and arrangement of these tongues orsegments. The invention is particularly useful in connection with moldsfor casting chill rolls, but may be used for other purposes.

Referring to the accompanying drawings, the numeral 2 designates one ofthe mold sections provided with the usual lifting trunnions A number ofthese mold sections or chills are superimposed to form a mold of thedesired height according to the length of the roll which is to be cast.

The inner portion ofeach mold section or chill is formed by a pluralityof radial tongues or segments 4, which are separated from cach other bythe narrow slots or silts 5. In accordance with my invention, theseslots or slits, instead of extending in a direction parallel to thevertical axis of the mold, are arranged obliquely, as clearly shown inFig. 2. Preferably, the slots or slits are so arranged that when anumber of mold sections or chills are superimposed, as shown in Fig. 2,the slots or slits of adjacent mold sections or chills will be instaggered relation to each other. The slots or slits, instead ofextending in oblique straight lines may extend in oblique curved lines,as shown at 6 in Fig. 3.

The oblique arrangement of the slots or slits gives a number ofimportant advantages, which may be stated as follows.

In cast-ing lwith molds of this character, cracks often occur, thesecracks generally running in lines which are substantially parallel tothe vertical axis of the roll or other article being cast. The provisionof vertical slots or slits tends to induce the formation of such cracks.By arranging the slots or slits obliquely, the tendency to crack islargely overcome, since the slots or slits are in a direction whichconstantly diverges from any point where the cracks tend to start. Thestaggered arrangement, as shown in Fig. 2, also further reduce theliability to cracking, since the lines formed by the slots are broken ateach mold section.

The oblique arrangement also facilitates free venting of the mold as themolten metal in iowing into the mold is constantly passing the openingsformed by the slots. Where the slots are vertically arranged, the metalmust How the full length of the chill or mold section to a joint betweenyadjacent sections, in order to vent freely.

In the use of molds of this general character provided with verticaltongues, markings are left on the metal sheets which pass through thecast rolls. This is due to the fact that the metal at the slits or slotsbetween the tongues, whether the latter are lilled with some compositionsuch as blacking and molasses, or are unfilled, solidiies differentlyfrom that part cast in direct contact with the metal of the mold, whichresults in there being formed in the cast rolls longitudinally extendingportions of the metal which have a different form of crystallizationthan the remaining metal. Where these portions extend longitudinally ofthe rolls, the impress or markings upon the sheets passing through therolls extend transversely of the sheets andare difficult to entirelyremove by the cold rolling method of finishing. Where the slits or slotsextend obliquely in accordance with my invention, the correspondingmarkings upon the metal sheets also extend obliquely and are much moreeasily obliterated in the cold rolling operation.

It is also a matter of considerable difficulty to properly turn rollswhich are cast in chill molds having the vertical slits or slots, owingto the fact that the mold markings upon the rolls are presented squarelyto the bite of the cutting tools. By arranging I have hereiny shown andthe slots obliquely, the roll markings are pre sented obliquely to thecutting tools, which greatly facilitates the operation. rlhere is asimilar advantage in turning the inside of the mold chills or sections,due to my invention.

In the use of rolls made in chill molds, the

diilerence in the structureof metal atpor-y tions thcreoi1 correspondingto the slots or slits between the tongues causes the rolls to grip thesheet more firmly at these portions. `Where the slots are vertically Y-arranged, these points oi? maximum contact with the sheet areintermittent. With the oblique arrangement of the slots, these portionsot the rolls are in constant contact with the sheet, thus giving therolls a greater and more even pull on the metal being rolled.

I do not limit myseliI to the particular arrangements of the obliqueslots or slits which described, since these may be modified Withoutdeparting from the spirit and scope of my invention as defined in theappended claims.

I claim: v

i l. A mold chill consisting of an annular ring having its chillingsurface divided into connected sections separatedby slots or slits,

said slots or slits extending obliquely across the inner face of thechill and said inner face forming the outer Wall." of the mold, subistantially as described.

2. A chill mold comprising a plurality of superimposed mold sections orchills, each of said sections or chills having its' inner chilling,portion divided into a plurality of radial tongues or segmentsintegrally united at their bases to the body of the chill and separatedby slots or slits, said slots or slits extending in an oblique directionwith respect tothe vertical axis of the mold, substantially asdescribed. Y 3. VA chill mold comprising a plurality of superimposedmold sections or chills, each ot said sections or chills having itsinner chilling portion divided into a plurality of radial tongues orsegments separated by slots or slits, said slots or slits extending inan oblique direction With respect to the vertical axis of the mold, andadjacent mold sectionsor chills having the slots or slits staggered Withrespect to each other,'snb stantially asrdescribed. Y

In testimony whereof, l have hereunto set my hand.v v Y FRANK CORDES.

